Come on...Louis was 200 pounds at his best. During his absolute prime, he was down on the cards in the 13th when he KO'd light heavyweight Billy Conn. I realize the Klitscko's have had setbacks, but anyone with a pair of eyeballs can see that the likes of Dempsey, Louis and Marciano would be cannon fodder against the modern behemoths like Lennox, Wlad and Vitali.